Problem 09: [8 points] A ball of mass m = 6 kg is attached to the end of a light rigid rod of negligible mass. You swing the ball in a vertical circle of radius R = 2m, at a constant speed of v = 8 m/s. What is the work, W done by the rod on the ball as it moves from point D to A as shown in the figure? Assume the magnitude of acceleration due to gravity is g = 10 m/sz. A) 1201 B) +120] C) 60] D) +60] E) 0]